Microsoft 365 Outage: A Houston Business Plan for the Next One
Outlook, Teams And Copilot Down – When Microsoft Stumbles, Your Clients Still Expect An Answer
Microsoft is working several fixes at once to reduce the impact, get past its current blocker and return parts of its infrastructure to a healthy state. Its fuller update is under MO1550821 in the Microsoft 365 admin center and at status.cloud.microsoft. View on X
What this means for you: Email (Exchange Online) is the main problem; core Teams chat and meetings and files stored directly in SharePoint mostly work. Safe Links may be unable to check links in Outlook and Teams, so be careful clicking links in email. Next update due by 12:00 a.m. (midnight) Central at status.cloud.microsoft.
Show all earlier Microsoft updates (33)
- 10:57 p.m. Status pageMicrosoft found that its fixes set off a surge of traffic from its routing services to the servers behind them, and is working to find what is driving it. It is adding virtual machines for capacity and forcing servers stuck in a bad state to pick up the recent network change, but some of those servers are not syncing as expected.
- 10:36 p.m. XMicrosoft is adjusting, redistributing and selectively blocking traffic to steady its servers, and sees partial recovery in the regions where it has done so. View on X
- 10:22 p.m. Status pageMicrosoft is seeing partial recovery in the regions where it has adjusted how traffic is handled, redistributed it and blocked some of it, but the recovery is not holding. It is reviewing what else it can do to stabilize its infrastructure.
- 10:11 p.m. Status pageMicrosoft says there is no indication the outage is the result of malicious activity. It is still reviewing traffic flows and why the services are failing, and will apply what it learns to the fixes as it confirms which ones work.
- 9:37 p.m. Status pageMicrosoft is reviewing traffic flows and the affected infrastructure to find better ways to route traffic, and working out exactly why the services are failing so it can take specific steps to improve stability.
- 9:13 p.m. XMicrosoft confirmed the changes it applied to improve service are not working as expected. It is looking for other ways to add capacity while traffic stays unevenly balanced across its infrastructure. View on X
- 9:07 p.m. Status pageA setback. Microsoft says the capacity change it applied is not working as expected. It is looking for other ways to add capacity while traffic stays unevenly balanced across its infrastructure.
- 8:14 p.m. Status pageRegions were starting to come back online, and Microsoft began adding infrastructure capacity to handle their traffic.
- 7:59 p.m. XPositive results from restarting the affected infrastructure and bringing servers back one isolated section at a time. Microsoft is watching those sections to confirm they stay stable. View on X
- 7:50 p.m. Status pagePositive results from restarting the affected infrastructure; Microsoft began watching the restarted servers for stability and planned to widen the fix as it holds.
- 7:06 p.m. Status pageCause found: the process that sets up secure connections on the affected servers gets overwhelmed. Microsoft began testing a configuration change for it and rolling back a recent network configuration change that lines up with the start of the outage.
- 7:01 p.m. XMicrosoft revised its list of affected services and features, posted under MO1550821 and at status.cloud.microsoft. View on X
- 6:56 p.m. Status pageMicrosoft narrowed the impact to features that depend on Exchange Online and email. Core Teams chat and meetings and files stored directly in SharePoint mostly work; Safe Links may not check links.
- 6:08 p.m. Status pageMicrosoft began limiting traffic types to find whether one kind of request is behind the problem, and rebuilding some servers on an earlier software configuration to test whether that keeps them responding.
- 6:06 p.m. XServers brought back could stop responding again once traffic reached them. Microsoft began studying diagnostic data and limiting which types of traffic reach the affected infrastructure. View on X
- 5:06 p.m. Status pageMicrosoft began limiting traffic in one location to ease the load, and said service may return gradually as apps reconnect. Universal Print added to the affected list.
- 5:04 p.m. XPart of the affected servers were back in service and stable so far, traffic was moving to other routes, and Microsoft saw limited recovery. View on X
- 4:11 p.m. Status pageMicrosoft began fully isolating part of its infrastructure, restarting the affected parts and adding traffic back slowly, and weighed keeping traffic inside each region. Intune, Defender for Office 365, Power BI PDF exports of sensitivity-labeled reports and the Microsoft 365 Apps admin center added to the affected list.
- 4:09 p.m. XThe steps so far had not brought the relief Microsoft expected. A core process on the affected servers was getting overwhelmed, making servers stop responding and cutting capacity. View on X
- 3:41 p.m. Status pageSame as the 3:40 p.m. post on X, adding that Microsoft was looking for ways to speed up the server restarts.
- 3:40 p.m. XMicrosoft was restarting and checking the affected servers, and weighing whether rolling back a few recent configuration updates would speed up recovery. View on X
- 3:01 p.m. Status pageMicrosoft Purview services, including Data Loss Prevention, Auto Labelling, Communication Compliance and Data Classification, added to the affected list. Microsoft began investigating a small number of recent configuration updates as possible contributors.
- 3:00 p.m. XA different way of running the server health checks brought a subset of affected servers back into service, and Microsoft began rolling it out more widely, along with automated recovery for servers that stop responding. View on X
- 2:44 p.m. Status pageWhile testing its fix, Microsoft found many affected servers had stopped responding, so it could not confirm the fix worked. It began restarting them with the change in place and applying the approach more widely.
- 2:32 p.m. Status pageMicrosoft began rolling out a change on some servers that bypasses the component behind the failed health checks, and started looking into high processor usage on the affected servers. Planner and To Do were added to the affected list.
- 2:19 p.m. XNo recent change is tied to the start. The failed health checks may come from one component that processes server health, and Microsoft took steps to stop more servers from being affected. View on X
- 1:50 p.m. XTesting a configuration change for the problem that makes servers fail automated health checks and drop out. All affected servers are being restarted and watched as they return. View on X
- 1:31 p.m. XThe high load is not caused by more traffic. A number of servers became unavailable unexpectedly, which strains the rest, and Microsoft is returning them to service. View on X
- 1:12 p.m. XAll deployments paused, more traffic moved off the affected infrastructure, and affected servers being restarted. View on X
- 12:48 p.m. XConnection traffic being spread across Microsoft's wider worldwide infrastructure to balance the load. View on X
- 12:35 p.m. XPart of Microsoft's infrastructure is under high load in multiple regions, likely causing the connection errors. Second incident MO1550821 opened. View on X
- 12:07 p.m. XThe issue may affect Microsoft 365 connections for users in any region, not just the Americas. View on X
- 11:54 a.m. XFirst report: users in the Americas having trouble reaching Exchange Online mailboxes. Incident EX1550543 opened. View on X
Times Central, newest first. Each update is summarized from Microsoft's own post on its status page or on X; Microsoft posts to the two at different times. Track the incidents as EX1550543 and MO1550821 in the Microsoft 365 admin center. CinchOps updates this box when Microsoft posts new information.
A Houston Business Plan for the Next One
Close to 130,000 Outlook problem reports hit Downdetector on Thursday, November 12, starting in the Houston lunch hour. Here is what to do in the first hour, and what to set up before Microsoft's next outage.
A Microsoft 365 outage is a failure on Microsoft's side that stops a business from reaching Outlook email, Teams, SharePoint files or Copilot, even though its own computers and internet line are working. On Thursday, November 12, 2026, one began just before noon in Houston.
User reports started climbing on Downdetector at 11:39 a.m. Central, and by 12:09 p.m. Outlook alone had 128,874 of them, according to Techaeris. Microsoft first described trouble reaching Exchange Online mailboxes in the Americas, then widened the warning to users in any region 13 minutes later. Its status page named Exchange Online, Teams, SharePoint Online, Copilot 365 and Microsoft Defender XDR.
This was the second large Microsoft 365 outage of 2026. On January 22, Microsoft acknowledged a North American infrastructure problem at 1:37 p.m. Central, and The Register reported access was restored about ten hours later. Both started during the Houston business day.
CinchOps provides managed IT support specifically for Houston businesses with 10 to 200 employees that run on Microsoft 365, with help desk requests answered in under 15 minutes at a flat $100 to $250 per user per month.
What Happened in the November 12 Microsoft 365 Outage
The timeline in Central time, what Microsoft said, and what it had not said by mid-afternoon.
The November 12, 2026 Microsoft 365 outage, logged as incident EX1550543 in the Microsoft 365 admin center, stopped Outlook, Teams, SharePoint Online and Copilot for consumer and business accounts. Microsoft blamed elevated load on a portion of its infrastructure across multiple regions and had not named a root cause by mid-afternoon.
We're investigating reports of users experiencing issues accessing Exchange Online mailboxes through multiple connection methods in the Americas. More details can be found in the Microsoft 365 admin center under EX1550543.
- Microsoft 365 Status (@MSFT365Status) November 12, 2026
Microsoft's status updates moved quickly from symptom to repair. At 12:35 p.m. Central it said the affected infrastructure was "experiencing elevated load across multiple regions," and that it was reviewing "an unexpected increase in a specific type of service traffic." At 12:48 p.m. it began spreading connection traffic across wider infrastructure. At 1:12 p.m., SFGATE reported, Microsoft posted on X that it had paused all deployments, moved more traffic off the affected systems and started restarting servers.
The outage reached past Microsoft's own apps. CNET reported that OpenAI and Anthropic both saw their Microsoft 365 connectors fail, with Anthropic saying mail, calendar and search tools were "failing for most requests." Microsoft's own status page did not load for a time. As of CNET's 1:53 p.m. Central update, Microsoft had not declared the incident resolved.
The First Hour of a Microsoft 365 Outage Decides the Damage
How a Houston office tells its own problem from Microsoft's, and which well-meant fixes to stop.
In the first hour of a Microsoft 365 outage, confirm whose problem it is before anyone touches a setting. Check Microsoft 365 Status on X or Service health in the admin center, test Outlook on a phone off the office Wi-Fi, and then call active clients instead of emailing them.
The expensive part of a vendor outage is often the hour staff spend fixing the wrong thing. People reboot the router, uninstall Outlook, reset their passwords or call three different vendors. None of that helps when the fault sits in Microsoft's data centers, and a password reset adds a second job once service returns: every phone and laptop then needs the new password.
Treat any email that arrives during or right after an outage asking staff to "re-verify" a mailbox or sign in again as suspect. A real outage gives attackers a believable story. Forward those messages to whoever handles cybersecurity before anyone clicks.
Then switch to the phone. A law firm with a filing due, a CPA practice in November tax planning or an engineering firm waiting on a bid addendum should call the clients and partners who expect email today. One line on the main voicemail greeting that says email is delayed by a Microsoft outage saves a dozen callbacks.
Set Up These Fallbacks Before the Next Microsoft 365 Outage
A fallback for each kind of work that stopped on November 12, and who in a small office should own it.
A Houston business cannot prevent a Microsoft 365 outage, but it can decide in advance how each kind of work continues without it. Every fallback below shares one rule: it must not sign in through Microsoft 365, because the outage takes the sign-in down with the apps.
The table below pairs each kind of work that stopped on November 12 with a fallback a 10 to 200 person office can set up in a week, and the role that should own it.
| Work that stopped | Fallback to set up now | Who owns it |
|---|---|---|
| Client email in Outlook | A printed or phone-stored list of active clients and their direct numbers, plus a voicemail greeting you can change in one minute | Office manager |
| Teams chat and meetings | A text group or phone bridge on a phone system that does not sign in through Microsoft 365 | Owner or operations lead |
| Shared files in SharePoint | This week's deadline files kept synced to the laptops of the people working on them | Each team lead |
| Copilot and connected AI tools | A written manual step for any workflow that now runs through Copilot or an AI connector | Whoever built the workflow |
| Defender XDR security alerts | A named person at your IT provider who watches threats when the Microsoft portal is unreachable | IT provider |
| Knowing what is going on | One person who checks Microsoft 365 Status and tells everyone else, so nobody starts local fixes | Office manager |
A backup does not belong on this list, and that surprises people. Microsoft 365 backup protects mail and files from deletion, ransomware and mistakes, which matters a great deal after an outage when rushed staff delete the wrong folder. It does not keep Outlook running while Microsoft's servers are overloaded. For that hour, the phone and the printed list do the work.
Put the six fallbacks on one page, print it, and walk through it at the next staff meeting. Use the CinchOps IT outage calculator to put a dollar figure on an afternoon like November 12, which makes the half hour of setup an easy decision.
You cannot fix Microsoft's outage, so stop trying. Confirm it in ten minutes, keep your people from resetting passwords and rebooting routers, and pick up the phone for the clients who expect email today. The plan is a printed page.
Are your Microsoft 365 mail and files backed up outside Microsoft?
CinchOps backup and recovery keeps immutable, verified copies of Houston businesses' Microsoft 365 mail and files, along with servers and laptops, stored outside the Gulf Coast flood zone.
See CinchOps backup and recovery →How CinchOps Can Help Houston Businesses Through a Microsoft 365 Outage
CinchOps is a managed IT services provider based in Katy, Texas, serving small and mid-sized businesses across the Houston metro area. CinchOps specializes in cybersecurity, network security, managed IT support, VoIP, and SD-WAN for businesses with 10 to 200 employees.
During a Microsoft 365 outage, CinchOps does the part a small office should not have to: confirming the cause, stopping the local fixes and keeping security watched while the portal is down. The pairing below shows where each problem meets a CinchOps service.
- Managed IT support answers help desk requests in under 15 minutes, so the "is it us or Microsoft?" question gets a real answer early in the outage.
- A VoIP phone system that does not depend on Microsoft 365 keeps the main line, forwarding to cell phones and the voicemail greeting working when Outlook and Teams do not.
- Cybersecurity services include 24/7 threat monitoring, and outage-themed phishing gets the same attention as any other attack.
- Backup and recovery covers Microsoft 365 mail and files with immutable, verified copies, included in the top-tier plan.
- CinchOps vCIO services and cloud services can help turn the six fallbacks into a one-page outage card for offices across Houston, Katy and Cypress, including law firms, CPA firms and engineering firms.
Microsoft will have another outage, and it will probably land in the middle of a Houston workday again. Write the one-page plan while November 12 is fresh, and talk to CinchOps if you want help with the phones, the backup and the first call.
Frequently Asked Questions
Was the November 12, 2026 Microsoft 365 outage a cyberattack?
No. At 10:11 p.m. Central on November 12, Microsoft said there is no indication the outage is the result of malicious activity. Earlier that evening it traced the failures to an overloaded process on its servers that sets up secure connections, and began rolling back a recent network configuration change that lined up with the start.
How can I tell if it is Microsoft or my own network?
Check Microsoft 365 Status on X or Service health in the Microsoft 365 admin center first. Then open Outlook on a phone using cellular data, off the office Wi-Fi. If Outlook fails there too and other websites still load in the office, the problem is Microsoft's, and local fixes will not help.
Should staff reset their passwords during a Microsoft 365 outage?
No. A password reset does not fix a Microsoft capacity problem, and every phone and laptop then needs the new password once service returns. Treat any email asking staff to re-verify a mailbox during an outage as possible phishing and report it.
Does a Microsoft 365 backup keep email working during an outage?
No. A Microsoft 365 backup protects mail and files from deletion, ransomware and mistakes, and lets you restore them later. It does not keep Outlook available while Microsoft's servers are down. For the outage itself, the fallback is a phone system outside Microsoft 365 and a printed client contact list.
What does Microsoft 365 outage support cost a Houston business?
Managed IT support for Houston businesses is usually priced per user per month. The CinchOps rate is $100 to $250 per user per month, flat, with help desk requests answered in under 15 minutes. Microsoft 365 backup and recovery are included in the top-tier plan, which also covers servers and laptops.
Discover More
Sources
- Techaeris, "Microsoft 365 Outage Takes Down Outlook, Teams and Copilot" (November 12, 2026)
- CNET, Jon Reed, "Is Microsoft Outlook Down? What We Know Now" (live coverage, November 12, 2026)
- SFGATE, Matthew Brown, "Microsoft reports global outages, thousands of Outlook users affected" (November 12, 2026)
- The Register, Microsoft 365 outage report (January 23, 2026)
